Alert archive / Missouri / Flash Flood Watches in 2008
Flash Flood Watch 19, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood watch at Sep 2, 2008, 3:57 PM CDT for 26 counties in Missouri; 11 counties in Illinois. It took effect at Sep 3, 2008, 5:29 AM CDT. It was in force for 33 hr.
The area
The counties it named.
The facts
- Issued
- Sep 2, 2008, 3:57 PM CDT (20:57 UTC)
- In effect from
- Sep 3, 2008, 5:29 AM CDT
- Expired
- Sep 4, 2008, 2:18 PM CDT
- In force
- 33 hr
- Issued by
- NWS St. Louis, MO
- Flood severity
- None
All 37 counties
Adams County, IL, Brown County, IL, Calhoun County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Monroe County, IL, Montgomery County, IL, Pike County, IL, Saint Clair County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Louis County, MO, Shelby County, MO, Warren County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 45 km from the middle of the area, began a volume at 21:03 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Springfield, MO (KSGF), launched 12:00Z, 9.0 hours before the alert went out and 328 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 477 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 830 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- -58 m²/s²
- 0-3 km storm-relative helicity
- -19 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS St. Louis, MO wrote its last area forecast discussion before this flash flood watch went out at Sep 2, 3:45 PM CDT, 12 minutes earlier.
Area forecast discussion, Sep 2, 3:45 PM CDT, 12 minutes before
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</html>Hazardous weather outlook, Sep 2, 6:07 AM CDT, 9 hours 50 minutes before
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</html>Nearby
Flash Flood Watches in Missouri, 2008Flash Flood Watches in Illinois, 2008Every flash flood watch in 2008
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.